(no subject)

I realize it's a bit of a long shot, but does anyone happen to know about what kinds of muscular dystrophy testing were in use in the late seventies or early eighties? I know is a technique in which needles are inserted into the muscles to test their electrical conductivity -- is there one in which needles are similarly inserted and a charge run through them? And was there anything like biofeedback stuff being used, or perhaps something that looked a lot like biofeedback?